As she was getting the fishing pole all rung up, she had to fart really really badly. She decided since the man was blind that it really wouldn't matter if she farted in front of him so she just let it loose.

All of a sudden the man says, "It all comes up to $80."

Confused the lady says to him, "But you said the fishing pole was only $70."

He said, "It is. Its $70 for the fishing pole and $10 for the duck call."